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Scratch resistant refinish clearcoat

a refinishing and clearcoat technology, applied in the direction of coatings, transportation and packaging, synthetic resin layered products, etc., to achieve the effect of increasing the scratch resistance and/or reflow

Active Publication Date: 2013-08-08
BASF COATINGS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a scratch-resistant coating for automotive vehicles that can be applied in a single step. The coating is made from an unsaturated fatty acid ester polyol and an acrylic polymer. The composition does not contain any drier and is free of any oxidative cure. The coating has improved scratch resistance and reflow, meaning it can withstand deformation without losing its shape. The patent also describes a method for preparing the coating and applying it to a substrate. The technical effects of this patent are improved scratch resistance and reflow of a refinish topcoat, which can be achieved by using a specific composition and curing process.

Problems solved by technology

Proposals for improving scratch and mar resistance have included using silicone or fluorinated polymers or additives, which are relatively expensive and can cause other problems (e.g., cratering in the coating and difficulty for recoat).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Comparative Example

[0029]A two-component clearcoat refinish coating composition was prepared by combining the following materials in a separate first component and a separate second component.

[0030]Component 1: A 56% non-volatile clearcoat formulation was prepared, comprised of a styrenated acrylic resin with a Tg of 24° C., a hydroxyl number of 136 mg. KOH / gm., and a number average molecular weight of 1400 daltons, a styrenated acrylic resin with a Tg of 78° C., a hydroxyl number of 73 mg. KOH / gm., and a number average molecular weight of 6500 daltons, in a ratio of 84:16 first: second acrylic. The remainder of the clearcoat formulation was comprised of solvents, such as methyl iso-amyl ketone, n-butyl acetate, aromatic 100, xylene, ethyl 3-ethoxypropionate and acetone, and additives well known in the art, such as UV absorbers, silicone based flow agents, plasticizers and tin based catalysts.

[0031]Component 2: A 72% non-volatile hardener formulation was prepared, comprised of a sol...

example 2

Example of the Invention

[0033]A two-component clearcoat refinish coating composition was prepared by combining the following materials in a separate first component and a separate second component.

[0034]Component #1: To Component #1 of Example 1, Polycin M-365® (Vertellus Specialties Incorporated) was added in a weight ratio of 83:17.

[0035]Component # 2: Component # 2 was the same as Component #2 in Example 1.

[0036]Component #1 and Component #2 were combined in a 63:37 weight ratio, resulting on a hydroxyl:isocyanate ratio of 1:1.2, reduced further with the above mentioned solvents to a non-volatile content of 34-38%, and spray applied over a test panel precoated with a BASF 90-Line black basecoat. The panel was allowed to dry at ambient temperatures for 15 minutes, then placed in a 140° F. for 18 hours before testing.

example 3

Comparative Example

[0037]Component 1: A 49% non-volatile clearcoat formulation was prepared, comprised of a styrenated acrylic resin with a Tg of 9° C., a hydroxyl number of 125 mg. KOH / gm., and a number average molecular weight of 2700 daltons. The remainder of the clearcoat formulation was comprised of solvents, such as ethylene glycol butyl ether, methyl acetate, parachlorobenzotrifluoride, ethyl 3-ethoxypropionate and acetone, and additives well known in the art, such as UV absorbers, silicone based flow agents, plasticizers and tin based catalysts.

[0038]Component 2: A 37% non-volative hardener formulation was prepared, comprised of a solution of a hexamethylene diisocyanate based trimer with a percent isocyanate content of 23.5%. The remainder of the hardener formulation was comprised of solvents, such as methyl acetate, parachlorobenzotrifluoride.

[0039]Component #1 and Component #2 were combined in a 63:37 weight ratio, resulting on a hydroxyl:isocyanate ratio of about 1:1.2, ...

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Abstract

Scratch resistance and / or reflow of a refinish topcoat is improved by preparing the topcoat from a refinish topcoat coating composition comprising an unsaturated fatty acid ester polyol that does not undergo oxidative cure when the applied refinish topcoat coating composition is cured.

Description

FIELD OF THE DISCLOSURE[0001]The present invention relates to automotive refinish compositions, to methods for preparing and using such compositions, to refinish coatings on a substrate, and to articles such as automotive vehicles with refinish coatings on them.INTRODUCTION TO THE DISCLOSURE[0002]Automotive topcoat finishes include basecoat / clearcoat topcoats, in which the topcoat is applied in two layers, a first layer of a pigmented basecoat composition and a second layer of a clearcoat composition, as well as single-stage or monocoat topcoats, which are one-layer, pigmented, glossy topcoats. Basecoat / clearcoat coatings are desirable for their high level of gloss and depth of color. In addition, basecoats having special effect pigments, e.g., flake pigments such as metallic and pearlescent pigment, can achieve excellent gonioapparent effect in basecoat / clearcoat composite coatings.[0003]Polyurethane clearcoat and single stage topcoat (or monocoat) systems have been widely used for...

Claims

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Application Information

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IPC IPC(8): C09D133/14
CPCC08G18/36C08G18/6229C09D133/14C08G18/6547C09D175/04C08G18/6254Y10T428/31551
Inventor RIHAN, ALITYE, ANTHONY J.
Owner BASF COATINGS GMBH
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